Congratulations on landing a job at a prestigious, nationally recognized leader in the field of innovative health care (and that's putting it mildly!).
You have been blessed by this, use it wisely. As another poster pointed out, learn everything you can. Seek out others who will not "eat their young" and by the end of your first year, you will be nearer finding out what your true niche is in nursing. Some are fortunate enough when they first start out they know and stay in the same area of nursing. But nursing is a profession where there are many avenues to travel and learn. Attend as many educational offerings by the hospital as you can, go to all staff meetings, offer to help others on your unit when you can do so without jeopardizing your own assignment, be kind, SMILE (a lot), be confident (but not over confident) --you made it through nursing school and passed boards - - you have a reason to smile and to show confidence.
You said you are a new grade but not knowing the educational level you have already achieved, if you have not at least attained a BSN, I encourage you to do so. Use the ethical principles of autonomy, beneficence, nonmaleficence, and justice in all you do both on and off the job. Remember that you are now a representative of the hospital and even your off-duty behavior can affect your position at the hospital.
If you unsure of how to do something, ASK. If you feel uncomfortable in a situation, SPEAK. If you do not know how to use a certain device or supply item, SEEK someone who can help you.
I have a feeling you will be an excellent nurse. Most important....BELIEVE in YOU!!!
Best of luck in your new job and in what I hope will be a long, rewarding, and fulfilling career in the field of helping others.